wrote in :

On Fri, 27 Nov 2009 12:45:00 -0500, Tony Sivori
wrote:

tnom wrote:
wrote:

http://www.sprayandforget.com/

I don't care if it's eco friendly or not. It works. I had black algae
stains all over my white shingled roof. They are gone. Not plants or
animals were harmed in the process.

Do you have a bottle of Spray and Forget handy? If so, would you please
post the listed active ingredients from the label?

Benzylkonium Chloride

From Wiki: http://en.wikipedia.org/wiki/Benzalkonium_chloride

It is used in pharmaceuticals such as leave-on skin antiseptics,
hygienic towelettes, and wet wipes, Lysol and ethanol-free solutions
are often used in preparations used for skin disinfection prior to use
of syringes.


Nice suff...Wonder if Rover will be rigid yet when Mr Fixit comes off the
roof.


[from the link]

Benzalkonium chloride, also known as alkyldimethylbenzylammonium chloride
and ADBAC,
.....
ADBAC is highly toxic to fish (LC50 = 280 ?g ai/L), very highly toxic to
aquatic invertebrates (LC50 = 5.9 ?g ai/L), moderately toxic to birds
(LD50 = 136 mg/kg-bw), and slightly toxic to mammals (LD50 = 430 mg/kg-
bw).[4] Benzalkonium chloride solutions of 10% or more are toxic to
humans, causing irritation to the skin and mucosa, and death if taken
internally.[5]